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I have a lab project in physics and I'm having a bit of trouble. We measured the Applied force of a moving block of wood using a spring scale. The first trials were don't with just the table , knowing the mass and applied force I was able to find the friction force; simply it was the same as F app. My problem now is that we did other trials on sandpaper, and I have the Applied force and mass and I don't know how to find the mass. We are suppose to find the Co efficent of friction, but not through math ; we have to use a graph where : y = mx aka Ff=U*Fn

Which isn't too bad, I just can't figure out how to get Force friction with only the mass and applied force when it is using the sand paper.

Mass = 0.27952 kg Force applied = 2.0N

Fn = Fg

mg= 0.27952(9.8)= 2.739296 N

Help please

2. Relevant equations

3. The attempt at a solution

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# Finding force of friction

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